You will learn how to rename a data frame columns in R. This tutorial describes how to reorder rows, in your data table, by the value of one or more variables. You will learn how to easily sort a data frame rows in ascending and descending orders. You will learn how to identify and to remove duplicate data using R base and dplyr functions. This tutorial describes how to subset or extract data frame rows based on certain criteria. Additionally, we'll describe how to subset a random number or fraction of rows. You will also learn how to remove rows with missing values in a given column. You will learn how to select data frame columns by names and position. We’ll also show how to remove columns from a data frame.